diff --git a/trace-events b/trace-events
index ffaa3f472e..55e80be1d1 100644
--- a/trace-events
+++ b/trace-events
@@ -776,7 +776,7 @@ pvscsi_update_irq_msi(void) "sending MSI notification"
 pvscsi_cmp_ring_put(unsigned long addr) "got completion descriptor 0x%lx"
 pvscsi_msg_ring_put(unsigned long addr) "got message descriptor 0x%lx"
 pvscsi_complete_request(uint64_t context, uint64_t len, uint8_t sense_key) "completion: ctx: 0x%"PRIx64", len: 0x%"PRIx64", sense key: %u"
-pvscsi_get_sg_list(int nsg, size_t size) "get SG list: depth: %u, size: %lu"
+pvscsi_get_sg_list(int nsg, size_t size) "get SG list: depth: %u, size: %zu"
 pvscsi_get_next_sg_elem(uint32_t flags) "unknown flags in SG element (val: 0x%x)"
 pvscsi_command_complete_not_found(uint32_t tag) "can't find request for tag 0x%x"
 pvscsi_command_complete_data_run(void) "not all data required for command transferred"